Cite as: 508 U. S. 439 (1993)
Opinion of the Court
the constitution, to which the judicial power of the United States would extend") (Marshall, C. J.). The contrary conclusion would permit litigants, by agreeing on the legal issue presented, to extract the opinion of a court on hypothetical Acts of Congress or dubious constitutional principles, an opinion that would be difficult to characterize as anything but advisory.
Nor did prudence oblige the Court of Appeals to treat the unasserted argument that section 92 had been repealed as having been waived. Respondents argued from the start, as we noted, that section 92 was not authority for the Comptroller's ruling, and a court may consider an issue "antecedent to . . . and ultimately dispositive of" the dispute before it, even an issue the parties fail to identify and brief. Arcadia v. Ohio Power Co., 498 U. S. 73, 77 (1990); cf. Cardinal Chemical Co. v. Morton Int'l, Inc., ante, at 88-89, n. 9 (addressing a legal question as to which the parties agreed on the answer). The omission of section 92 from the United States Code, moreover, along with the codifiers' indication that the provision had been repealed, created honest doubt about whether section 92 existed as law, and a court "need not render judgment on the basis of a rule of law whose nonexistence is apparent on the face of things, simply because the parties agree upon it." United States v. Burke, 504 U. S. 229, 246 (1992) (Scalia, J., concurring in judgment). While the Bank says that by initially accepting the widespread assumption that section 92 remains in force, respondents forfeited their right to have the Court of Appeals consider whether the law exists, "[t]here can be no estoppel in the way of ascertaining the existence of a law," South Ottawa v. Perkins, 94 U. S. 260, 267 (1877). In addressing the status of section 92, the Court of Appeals did not stray beyond its constitutional or prudential boundaries.
The Court of Appeals, accordingly, had discretion to consider the validity of section 92, and under the circumstances did not abuse it. The court was asked to determine under
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